Description of problem:
Packages use zlib from minizip may experience crashes recently, for example, quazip package. Because of one of the function of zlib breaks backward compatibility.

Version-Release number of selected component (if applicable):
minizip-1.2.5-2.fc14.i686

How reproducible:
Everytime call function unzGetCurrentFileInfo with NULL as pfile_info.

extern int ZEXPORT unzGetCurrentFileInfo (unzFile file,
                                          unz_file_info * pfile_info,
                                          char * szFileName, uLong fileNameBufferSize,
                                          void *extraField, uLong extraFieldBufferSize,
                                          char* szComment,  uLong commentBufferSize)

  
Actual results:
SIGSEGV

Expected results:
Accept NULL parameter and do nothing about it.

Proposed Patch:

--- zlib-1.2.5.bak/contrib/minizip/unzip.c	2011-02-15 15:14:11.759197952 +0000
+++ zlib-1.2.5/contrib/minizip/unzip.c	2011-02-15 15:14:57.620493214 +0000
@@ -1145,7 +1145,7 @@
                                                 szFileName,fileNameBufferSize,
                                                 extraField,extraFieldBufferSize,
                                                 szComment,commentBufferSize);
-    if (err==UNZ_OK)
+    if (pfile_info && err==UNZ_OK)
     {
         pfile_info->version = file_info64.version;
         pfile_info->version_needed = file_info64.version_needed;